Adding "adapter" ORTC objects on top of ChannelManager/BaseChannel/etc.

webrtc/api/mediatypes.cc

 /*
  *  Copyright 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/api/mediatypes.h"
 #include "webrtc/base/checks.h"
 
+namespace {
+static const char* kMediaTypeAudio = "audio";
+static const char* kMediaTypeVideo = "video";
+static const char* kMediaTypeData = "data";
+}  // namespace
+
 namespace cricket {
 
 std::string MediaTypeToString(MediaType type) {
-  std::string type_str;
   switch (type) {
     case MEDIA_TYPE_AUDIO:
-      type_str = "audio";
-      break;
+      return kMediaTypeAudio;
     case MEDIA_TYPE_VIDEO:
-      type_str = "video";
-      break;
+      return kMediaTypeVideo;
     case MEDIA_TYPE_DATA:
-      type_str = "data";
-      break;
-    default:
-      RTC_NOTREACHED();
-      break;
+      return kMediaTypeData;
   }
-  return type_str;
+}
+
+MediaType MediaTypeFromString(const std::string& type_str) {
+  if (type_str == kMediaTypeAudio) {
+    return MEDIA_TYPE_AUDIO;
+  } else if (type_str == kMediaTypeVideo) {
+    return MEDIA_TYPE_VIDEO;
+  } else if (type_str == kMediaTypeData) {
+    return MEDIA_TYPE_DATA;
+  } else {
+    FATAL();
+  }
 }
 
 }  // namespace cricket